| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| var binary = require('./binary'); |
| var InputBufferUnderrunError = require('./input_buffer_underrun_error'); |
| var THeaderTransport = require('./header_transport'); |
| |
| module.exports = TFramedTransport; |
| |
| function TFramedTransport(buffer, callback) { |
| this.inBuf = buffer || new Buffer(0); |
| this.outBuffers = []; |
| this.outCount = 0; |
| this.readPos = 0; |
| this.onFlush = callback; |
| }; |
| |
| TFramedTransport.prototype = new THeaderTransport(); |
| |
| TFramedTransport.receiver = function(callback, seqid) { |
| var residual = null; |
| |
| return function(data) { |
| // Prepend any residual data from our previous read |
| if (residual) { |
| data = Buffer.concat([residual, data]); |
| residual = null; |
| } |
| |
| // framed transport |
| while (data.length) { |
| if (data.length < 4) { |
| // Not enough bytes to continue, save and resume on next packet |
| residual = data; |
| return; |
| } |
| var frameSize = binary.readI32(data, 0); |
| if (data.length < 4 + frameSize) { |
| // Not enough bytes to continue, save and resume on next packet |
| residual = data; |
| return; |
| } |
| |
| var frame = data.slice(4, 4 + frameSize); |
| residual = data.slice(4 + frameSize); |
| |
| callback(new TFramedTransport(frame), seqid); |
| |
| data = residual; |
| residual = null; |
| } |
| }; |
| }; |
| |
| TFramedTransport.prototype.commitPosition = function(){}, |
| TFramedTransport.prototype.rollbackPosition = function(){}, |
| |
| // TODO: Implement open/close support |
| TFramedTransport.prototype.isOpen = function() { |
| return true; |
| }; |
| TFramedTransport.prototype.open = function() {}; |
| TFramedTransport.prototype.close = function() {}; |
| |
| // Set the seqid of the message in the client |
| // So that callbacks can be found |
| TFramedTransport.prototype.setCurrSeqId = function(seqid) { |
| this._seqid = seqid; |
| }; |
| |
| TFramedTransport.prototype.ensureAvailable = function(len) { |
| if (this.readPos + len > this.inBuf.length) { |
| throw new InputBufferUnderrunError(); |
| } |
| }; |
| |
| TFramedTransport.prototype.read = function(len) { // this function will be used for each frames. |
| this.ensureAvailable(len); |
| var end = this.readPos + len; |
| |
| if (this.inBuf.length < end) { |
| throw new Error('read(' + len + ') failed - not enough data'); |
| } |
| |
| var buf = this.inBuf.slice(this.readPos, end); |
| this.readPos = end; |
| return buf; |
| }; |
| |
| TFramedTransport.prototype.readByte = function() { |
| this.ensureAvailable(1); |
| return binary.readByte(this.inBuf[this.readPos++]); |
| }; |
| |
| TFramedTransport.prototype.readI16 = function() { |
| this.ensureAvailable(2); |
| var i16 = binary.readI16(this.inBuf, this.readPos); |
| this.readPos += 2; |
| return i16; |
| }; |
| |
| TFramedTransport.prototype.readI32 = function() { |
| this.ensureAvailable(4); |
| var i32 = binary.readI32(this.inBuf, this.readPos); |
| this.readPos += 4; |
| return i32; |
| }; |
| |
| TFramedTransport.prototype.readDouble = function() { |
| this.ensureAvailable(8); |
| var d = binary.readDouble(this.inBuf, this.readPos); |
| this.readPos += 8; |
| return d; |
| }; |
| |
| TFramedTransport.prototype.readString = function(len) { |
| this.ensureAvailable(len); |
| var str = this.inBuf.toString('utf8', this.readPos, this.readPos + len); |
| this.readPos += len; |
| return str; |
| }; |
| |
| TFramedTransport.prototype.borrow = function() { |
| return { |
| buf: this.inBuf, |
| readIndex: this.readPos, |
| writeIndex: this.inBuf.length |
| }; |
| }; |
| |
| TFramedTransport.prototype.consume = function(bytesConsumed) { |
| this.readPos += bytesConsumed; |
| }; |
| |
| TFramedTransport.prototype.write = function(buf, encoding) { |
| if (typeof(buf) === "string") { |
| buf = new Buffer(buf, encoding || 'utf8'); |
| } |
| this.outBuffers.push(buf); |
| this.outCount += buf.length; |
| }; |
| |
| TFramedTransport.prototype.flush = function() { |
| // If the seqid of the callback is available pass it to the onFlush |
| // Then remove the current seqid |
| var seqid = this._seqid; |
| this._seqid = null; |
| |
| var out = new Buffer(this.outCount), |
| pos = 0; |
| this.outBuffers.forEach(function(buf) { |
| buf.copy(out, pos, 0); |
| pos += buf.length; |
| }); |
| |
| if (this.onFlush) { |
| // TODO: optimize this better, allocate one buffer instead of both: |
| var msg = new Buffer(out.length + 4); |
| binary.writeI32(msg, out.length); |
| out.copy(msg, 4, 0, out.length); |
| if (this.onFlush) { |
| // Passing seqid through this call to get it to the connection |
| this.onFlush(msg, seqid); |
| } |
| } |
| |
| this.outBuffers = []; |
| this.outCount = 0; |
| }; |